Changes in Ceria-Supported Vanadium Oxide Catalysts during the Oxidative Dehydrogenation of Ethane and Temperature-Programmed Treatments

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• 作者：Maria V. Mart&iacute ; nez-Huerta ; Goutam Deo ; José ; Lu&iacute ; s G. Fierro ; Miguel A. Bañ ; ares
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：December 20, 2007
• 年：2007
• 卷：111
• 期：50
• 页码：18708 - 18714
• 全文大小：162K
• 年卷期：v.111,no.50(December 20, 2007)
• ISSN：1932-7455

文摘

The effect of vanadium oxide loading on CeO₂ support for ethane oxidative dehydrogenation (ODH) is studied.Surface vanadia species are highly dispersed on CeO₂. The interaction with surface vanadia species significantlychanges the structural and reactive properties of ceria support. VO_x/CeO₂ suffers an important change duringethane ODH due to a solid-state reaction between CeO₂ and surface vanadia species resulting in the formationof CeVO₄. Such a solid-state reaction is promoted by high temperature, high vanadium loading, and reducingenvironments. Raman in situ temperature-programmed studies under reduction and oxidation conditions revealthat the catalytic cycle involves oxidation-reduction of the Ce⁴⁺ Ce³⁺ species, while the V⁵⁺ speciesremain stable.